Read the post to find out how to do this using a second method, and other important things that you should know when changing a WordPress post's date - https://themeskills.com/change-date-w...
To change the date of a WordPress post, you have to:
1. Go to Posts - All posts;
2. Click on the post that you want to change the date to;
3. On the right side, in the Publish box, click the Edit link;
4. Set the date that you want;
5. Click the OK button;
6. Press the Update button.
That's it! You've successfully changed the date of your WordPress post.
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